| Methods |
CBA. Neither outcome assessment nor the analysis were undertaken blind to treatment group allocation. 70% of those allocated to the intervention group and 60% of those allocated to the control group were included in the analysis. An assessment of the distribution of confounders is presented and there were significant differences in rates of previous bicycle‐related injury but not frequency of riding or helmet ownership between intervention and control groups. |
| Participants |
404 4th and 5th grade children from 4 elementary schools in North Carolina, US |
| Interventions |
Education programme consisting of 7 lessons delivered in schools. The control group received none of the above interventions. |
| Outcomes |
Self reported helmet ownership; self reported helmet wearing. Measured at 8 weeks. |
| Notes |
Response rates at follow‐up are reported as approximately 70% for the intervention group and approximately 60% for the control group. Baseline helmet ownership rates were slightly higher in the control schools than the intervention schools and no adjustment has been made for this. |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Allocation concealment (selection bias) |
High risk |
Not used |
